Computer Systems

• What is the function of the CPU?

  To perform the fetch-decode-exectue cycle.
• What is the function of the ALU?

  The Arithmetic Logic Unit carries out mathematical and logical operations
• What is the function of the CU?

  The Control Unit sends signals to control how data moves around the CPU
• What is the function of cache?

  Provides fast access to frequently used instructions and data
• What are registers?

  Tiny, super-fast pieces of onboard memory inside the CPU, each with a specific purpose
• What is the function of the PC?

  The Program Counter holds the address of the next instruction to be executed in memory
• What is the function of the MAR?

  The Memory Address Register holds the memory address where data is to be fetched from or written to
• What is the function of the MDR?

  the Memory Data Register holds data fetched from memory or to be written to memory
• What is the function of the ACC?

  The Accumulator holds the results of calculations